JST: Technical Data

GENERAL PRODUCT RANGE

Power Rating

Product Range, kVA:

150 to 20000

Typical Values, kVA:

150

300

500

1000

1500

2000

2500

3000

3750

5000

7500

10000

12000

15000

20000

Primary Voltage

Product Range, kV:

2.3 to 34.5

Typical Values, kV:

2.3

5.0

8.7

15.0

25.0

34.5

Secondary Voltage

Product Range, kV:

2.3 to 13000

Typical Values, V:

208

240

480

2400

4600

6900

12470

13200

13800

Impedence

5.5% to 7.5% as a function of the HV, LV, and BIL ratings

Standard Product Features

Both HV & LV windings vacuum cast in epoxy
Step-lap mitered cruciform core
185 °C Cast epoxy insulation system
Vibration isolators protecting core & coil
UL listed

STANDARD PRODUCT SPECIFICATIONS AND AVAILABLE OPTIONS

Requirement

Applicability of Requirement

Design Value

Standard

Optional

Basic Impulse Levels, BIL

Rated voltages for transformer winding: 1.2kV

10 kV

20, 30 kV

(specified as a function of transformer winding voltage)

Rated voltages for transformer winding: 2.5kV

30 kV

45 kV

Rated voltages for transformer winding: 2.5kV

60 kV

75 kV

Rated voltages for transformer winding: 8.7kV

75 kV

95 kV

Rated voltages for transformer winding: 15kV

95 kV

10 kV

Rated voltages for transformer winding: 25kV

125 kV

150 kV

Rated voltages for transformer winding: 34.5kV

150 kV

170 kV

Winding Temperature Rise, °C

For all power ratings and voltage classes

80 °C

115 °C

Forced Air Rating

Transformers rated 150-3750 kVA

133%

150%

Transformers rated greater than 3750 kVA

133%

140%

Conductor Material

For all power ratings and voltage classes

Copper

Aluminum

Maximum Operating Ambient Temperature

Operating ambient temperature range -40 °C to 30 °C average, with specified maximum

40 °C max

50 °C max